This is an unknown commentary by an otherwise unknown author on Priscianus Caesariensis, Institutiones grammaticae, which is identified in the final rubric (fol. [4]v): 'Explicit Sententia magistri Iohannis de Frisia super totum [...] volumen [...]'. The preserved text refers to Book XVIII of Priscian and was therefore possibly only a commentary on the Priscian Minor. The bifolium 2-3 was the inner bifolium of the quire.